the obama administration has faced accusations it gave undeserved access to the film makers. in real life, everyone involved in the hunt for bin laden remains sworn to secrecy. but the film makers say they got firsthand accounts. they just won't say exactly how that happened. >> i think as a reporter you would understand we take protecting our sources and sort of the exact methodology of our sourcing pretty seriously, just in the same way if i asked you how exactly did you source that story. >> reporter: katherine, when you hear mark talk this way, are you a journalist or a film maker? >> that's a good question. well, i certainly try to be as faithful to the research as possible and make a good movie and make a film that was timely. >> reporter: but how much access they got is the issue. >> obviously things went wrong here. >> reporter: congressman peter king, chairman of the house homeland security committee, first called for an investigation at both the cia and the pentagon. >> there was an event where operatives were involved and they did not know until they got there that